netdev - Re: [Patch iproute2] tc: add hit counter for matchall

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Date:   Thu, 24 Jan 2019 09:47:06 +1300
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev@...r.kernel.org,
        Martin Olsson <martin.olsson+netdev@...torsecurity.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>, David Ahern <dsahern@...il.com>
Subject: Re: [Patch iproute2] tc: add hit counter for matchall

On Thu, 17 Jan 2019 13:18:55 -0800
Cong Wang <xiyou.wangcong@...il.com> wrote:

>  
> +	if (tb[TCA_MATCHALL_PCNT]) {
> +		if (RTA_PAYLOAD(tb[TCA_MATCHALL_PCNT])  < sizeof(*pf)) {
> +			print_string(PRINT_FP, NULL, "Broken perf counters\n", NULL);

This the wrong way to print an error message with iproute2 suite.
The correct answer is simple.
			fprintf(stderr, "Broken perf counters\n");
and better yet give a more informative message that says what is incorrect.